ForesTree - A Guide to Tree Health

Pest and Disease Information

Box Elder
  • Acer negundo - Susceptible to Aphids and Beetle Borers, Leaf Blight, Fusarium, Powdery Mildew, Root Rot and Verticillium. Additional and expanded information listed below.

  • For further tree information:
       SelecTree (60) | Silvics of North America
3 Records Found
Disease or Pest NameDescription of Disease or Pest

Phytophthora Root and Crown Rot
Phytophthora cactorum

phytophthora_cactorumThis disease, as its name implies, is characterized by red-brown exudate oozing from bark fissures in cankers on lower parts of the mainstem of the tree. Wood behind the wet areas is dead and stained reddi...

Powdery Mildew
Microsphaera alni

Powdery mildew may occur on any green plant tissue or on flowers and fruits. Light colored mats of fungal growth often appear on infected leaves. Infected leaves may drop prematurely and leaves and shoot...

Fruittree leafroller
Archips argyrospila

moth"Fruittree leafroller can be a serious pest throughout California. It occurs on a very large number of ornamental trees and is particularly damaging to deciduous and live oaks. Even if completely defoliate...